Vulnerability · Published Sep 27, 2026 · Assigned by VulnCheck
CVE-2026-100838Contrast before 1.19.1 CopyFile Policy Symlink Subversion
High 8.1
In plain English
A high-severity security flaw in contrast from edgelesssys. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 13% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
Contrast is a confidential-computing runtime for Kubernetes. In versions before 1.19.1, the Kata agent policies generated by the Contrast CLI contained a flaw in the CopyFile verification that allowed arbitrary writes to the guest root filesystem. A malicious process on the untrusted host able to connect to the Kata agent VSOCK could issue a series of CopyFile requests to overwrite security-critical files in the guest or trick the workload into disclosing sensitive data, effectively amounting to a full guest takeover. Users unable to upgrade can apply an equivalent rego policy fix passed to 'contrast generate --policy'.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/edgelesssys/contrast | 1.19.1 | GHSA-rh99-wc69-c255 |
| Go | github.com/edgelesssys/contrast | 1.19.1 | GO-2026-5624 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| edgelesssys | contrast | 0 – before 1.19.1 |
Weakness: CWE-59 · Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
References
- GitHub Security Advisory (GHSA-rh99-wc69-c255) vendor-advisory
- VulnCheck Advisory: Contrast before 1.19.1 CopyFile Policy Symlink Subversion third-party-advisory